My K3 is over 3 yr.s old. I read the posts & got the flashlight out. I can see & feel a crack across the front of the knob. About 1/4'' left of the set screw. Still seems OK. Anyone else see cracks or feel them on knob B. The 1st yr. I had two of the inner knobs on the AF & RF controls break. Elecraft replaced them very quickly. K9IL